<template>
  <a-modal
    ref="modal"
    :class="getClass(modalClass)"
    :style="getStyle(modalStyle)"
    :maskClosable="false"
    :visible="visible"
    v-bind="_attrs"
    v-on="$listeners"
    @ok="handleOk"
    @cancel="handleCancel"
  >

    <slot></slot>

    <template v-if="!isNoTitle" slot="title">
      <a-row class="j-modal-title-row" type="flex">
        <a-col class="left">
          <slot name="title">{{ title }}</slot>
        </a-col>
        <a-col v-if="switchFullscreen" class="right" @click="toggleFullscreen">
          <a-button class="ant-modal-close ant-modal-close-x" ghost type="link" :icon="fullscreenButtonIcon"/>
        </a-col>
      </a-row>
    </template>

    <!-- 处理 scopedSlots -->
    <template v-for="slotName of scopedSlotsKeys" :slot="slotName">
      <slot :name="slotName"></slot>
    </template>

    <!-- 处理 slots -->
    <template v-for="slotName of slotsKeys" v-slot:[slotName]>
      <slot :name="slotName"></slot>
    </template>

  </a-modal>
</template>

<script>

import { getClass, getStyle } from '@/utils/props-util'
import { triggerWindowResizeEvent } from '@/utils/util'

export default {
  name: 'JModal',
  props: {
    title: String,
    // 可使用 .sync 修饰符
    visible: Boolean,
    // 是否全屏弹窗，当全屏时无论如何都会禁止 body 滚动。可使用 .sync 修饰符
    fullscreen: {
      type: Boolean,
      default: false
    },
    // 是否允许切换全屏（允许后右上角会出现一个按钮）
    switchFullscreen: {
      type: Boolean,
      default: false
    },
    // 点击确定按钮的时候是否关闭弹窗
    okClose: {
      type: Boolean,
      default: true
    },
    maskClosable:{
      type: Boolean,
      default: true
    }
  },
  data() {
    return {
      // 内部使用的 slots ，不再处理
      usedSlots: ['title'],
      // 实际控制是否全屏的参数
      innerFullscreen: this.fullscreen
    }
  },
  computed: {
    // 一些未处理的参数或特殊处理的参数绑定到 a-modal 上
    _attrs() {
      const attrs = { ...this.$attrs }
      // 如果全屏就将宽度设为 100%
      if (this.innerFullscreen) {
        attrs['width'] = '100%'
      }
      return attrs
    },
    modalClass() {
      return {
        'j-modal-box': true,
        'fullscreen': this.innerFullscreen,
        'no-title': this.isNoTitle,
        'no-footer': this.isNoFooter
      }
    },
    modalStyle() {
      const style = {}
      // 如果全屏就将top设为 0
      if (this.innerFullscreen) {
        style['top'] = '0'
      }
      return style
    },
    isNoTitle() {
      return !this.title && !this.allSlotsKeys.includes('title')
    },
    isNoFooter() {
      return this._attrs['footer'] === null
    },
    slotsKeys() {
      return Object.keys(this.$slots).filter(key => !this.usedSlots.includes(key))
    },
    scopedSlotsKeys() {
      return Object.keys(this.$scopedSlots).filter(key => !this.usedSlots.includes(key))
    },
    allSlotsKeys() {
      return this.slotsKeys.concat(this.scopedSlotsKeys)
    },
    // 切换全屏的按钮图标
    fullscreenButtonIcon() {
      return this.innerFullscreen ? 'fullscreen-exit' : 'fullscreen'
    }
  },
  watch: {
    visible() {
      if (this.visible) {
        this.innerFullscreen = this.fullscreen
      }
    },
    innerFullscreen(val) {
      this.$emit('update:fullscreen', val)
    }
  },
  methods: {

    getClass(clazz) {
      return { ...getClass(this), ...clazz }
    },
    getStyle(style) {
      return { ...getStyle(this), ...style }
    },

    close() {
      this.$emit('update:visible', false)
    },

    handleOk() {
      if (this.okClose) {
        this.close()
      }
    },
    handleCancel() {
      this.close()
    },

    /** 切换全屏 */
    toggleFullscreen() {
      this.innerFullscreen = !this.innerFullscreen
      triggerWindowResizeEvent()
    }

  }
}
</script>

<style lang="less">
  .j-modal-box {

    &.fullscreen {
      top: 0;
      left: 0;
      padding: 0;

      // 兼容1.6.2版本的antdv
      & .ant-modal {
        top: 0;
        padding: 0;
        height: 100vh;
      }

      & .ant-modal-content {
        height: 100vh;
        border-radius: 0;

        & .ant-modal-body {
          /* title 和 footer 各占 55px */
          height: calc(100% - 55px - 55px);
          overflow: auto;
        }
      }

      &.no-title, &.no-footer {
        .ant-modal-body {
          height: calc(100% - 55px);
        }
      }

      &.no-title.no-footer {
        .ant-modal-body {
          height: 100%;
        }
      }
    }

    .j-modal-title-row {
      .left {
        width: calc(100% - 56px - 56px);
      }

      .right {
        width: 56px;
        position: inherit;

        .ant-modal-close {
          right: 56px;
          color: rgba(0, 0, 0, 0.45);

          &:hover {
            color: rgba(0, 0, 0, 0.75);
          }
        }
      }
    }
  }

  @media (max-width: 767px) {
    .j-modal-box.fullscreen {
      margin: 0;
      max-width: 100vw;
    }
  }
</style>
